package com.itcast.reggie.filter;

/**
 * @author hehehe
 * @ClassName LoginCheckFilter
 * @Description TODO
 * @date 2022/11/29/029 9:51
 * @Version 1.0
 */

import com.alibaba.fastjson.JSON;
import com.itcast.reggie.common.BaseContext;
import com.itcast.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已登录
 */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

//        long id = Thread.currentThread().getId();
//        log.info("线程ID：{}", id);

        // 1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}", requestURI);
        // 2、判断本次请求是否需要处理

        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        boolean check = check(urls, requestURI);
        // 3、如果不需要处理，则直接放行
        if (check) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        // 4、判断员工登录状态，如果已登录，则直接放行
        Long empId = (Long) request.getSession().getAttribute("employee");
        if (empId != null) {
            BaseContext.setCurrentId(empId);
            log.info("用户已登录，用户id为：{}", empId);
            filterChain.doFilter(request, response);
            return;
        }
        // 4、判断用户登录状态，如果已登录，则直接放行
        request.getSession().setAttribute("user",1598601375300751362L);
        Long userId = (Long) request.getSession().getAttribute("user");
        if (userId != null) {
            BaseContext.setCurrentId(userId);
            log.info("用户已登录，用户id为：{}", userId);
            filterChain.doFilter(request, response);
            return;
        }
        // 5、如果未登录则返回未登录结果
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     *
     * @param urls
     * @param resquestURL
     * @return
     */
    public boolean check(String[] urls, String resquestURL) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, resquestURL);
            if (match) {
                return true;
            }
        }
        return false;

    }
}
